Discrimination of Chair Seat Heights

JNDs, SDs, HSDs, and DNDs: The Weber-Fechner Law

“…An ophthalmologist uses a combination of these approaches (method of limits and method of paired comparisons) to select the right kind of eyeglasses for people's aging or genetically deficient eyes. Kirk et al (1967) conducted a study of the judgment of seat height by blindfolded participants and detected a JND of about a quarter of an inch. The purpose of these experimental approaches is to find out how perceptive people are -that is, how good are they at differentiating between the standard and the comparisons.…”

The Six Us: An Ergonomics Approach to Enhancing Product and Process Evaluations

“…With the combination of both the Five Ws and the Five Whys, the subjective opinions regarding the convenience of a particular item of furniture to complement design purely on the basis of anthropometry. Kirk, Ward, Asprey, Baker, and Peacock (1969) similarly varied the height of a chair surface, using psychophysical methods developed by Weber and Fechner 150 years ago, to obtain subjective comfort values (Fechner, 1860(Fechner, /1966. Moving forward to 2005, Stanton, Salmon, Walker, Baber, and Jenkins described a systematic method for user trials in interface design.…”

Ergonomic Evaluation of Console Chairs for a Weapon Locating Radar

“…A primary mission of console operators is to monitor radar imagery of the console display, while sitting on the console chair. Console chairs not considering operator's body characteristics can induce inconvenience, pain, or fatigue to console operators (ANSI/HFES 100, 2007;Grandjean, 1980;Kirk, 1969). Therefore, it is recommended that operator's body characteristics be considered in designing the console chair.…”